Has anyone used the Spray Foam Insulation for walls and ceiling vs. the batt insulation? If so, how does it work?

Fhubbell> I think we had one customer spray insulate their ceiling, but I am recalling that there was some strange circumstance involved - can't remember what is was. For walls, you'll lose a little space but I think installing foam or batting with the rvalue you desire, then covering with the cheapest liner panel you can acquire is perhaps the most cost effective yet durable option. Assuming you are talking about units with outside doors though, that's where you'll lose the most heat. Most customers tend to use insulation in those units just to control condensation from the roof.